Zero-thickness interface model formulation for failure behavior of fiber-reinforced cementitious composites

This paper deals with simulating the mechanical response of fiber-reinforced cementitious composites (FRCCs) by means of a zero-thickness interface model formulated within the framework of discrete-crack approaches. Following a similar model already available in literature for plain concrete, the formulation of the interface element is further developed and extended to capture the key mechanical phenomena controlling the FRCC behavior. An original approach is introduced for reproducing the complex influence of fibers on the cracking phenomena of the concrete/mortar matrix. Numerical analyses demonstrate the capabilities of the proposed model and show a very good agreement with experimental results on FRCC tests.

► The paper proposes a constitutive formulation to model the mechanical degradation and failure process of FRCC. ► The non-linear model is implemented in interface elements for discrete crack approach. ► The constitutive formulation is based on the flow theory of plasticity combined with fracture mechanics concepts. ► The bridging effect of fibers crossing concrete cracks is considered.